>>105
4B+C=-22.05、B+4C+D=-7.65、C+2D=0
⇔ 4B+C = -441/20、B+4C+D = -153/20、1C+2D = 0
B=-2781/520=-5.3480769...、C=-171/260=-0.6576923...、D=171/520=0.3288462...